<template>

  <div class="login_container">
    <!-- 登录框 -->
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png">
      </div>
      <!-- 登录表单 -->
      <el-form class="login_form_box" :model="loginForm" :rules="loginFormRules" ref="loginFormRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input  prefix-icon="el-icon-s-opportunity" type="password" v-model="loginForm.password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="form_btn_box">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>

</template>

<script>

export default {
  data () {
    return {
      loginForm: { // 登录表单数据绑定对象zs
        username: 'admin',
        password: '123456'
      },
      loginFormRules: { // 登录表单验证规则对象
        username: [ // 用户名验证规则
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 5, message: '请输入长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        password: [ // 密码验证规则
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 10, message: '请输入长度在 6 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () { // 点击重置按钮，重置表单
      this.$refs.loginFormRef.resetFields()
    },
    login () { // 点击登录按钮，实现用户登录
      this.$refs.loginFormRef.validate(async validate => {
        if (!validate) return
        var { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$msg.error('登录失败！')
        this.$msg.success('登录成功！')
        // 保存服务器提供的token 方便后面使用
        sessionStorage.setItem('token', res.data.token)
        // 跳转页面
        this.$router.push('/home')
      })
    }
  }
}

</script>

<style lang="less" scoped>

.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  height: 300px;
  width: 450px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #eee;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;

    img {
      height: 100%;
      width: 100%;
      border: 1px solid #ddd;
      border-radius: 50%;
      background-color: #eee;
    }
  }

  .login_form_box {
    position: absolute;
    box-sizing: border-box;
    bottom: 0;
    width: 100%;
    padding: 0 20px;

    .form_btn_box {
      display: flex;
      justify-content: flex-end;
    }
  }
}

</style>
